JP2669684B2 - Perforator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides a housing that contacts the ground and a hole that is provided in the housing and that is eccentric in parallel to the axial direction in order to form an expanded portion in the hole in the ground. A perforating device having a formed guide sleeve, an eccentric bushing for connecting a handle and being able to rotate through an angle of 180 ° in an eccentric hole of the guide sleeve, and a rotary shaft connected to a drive and having a cutting head. It is a thing.

[Conventional technology]

A hole having a flared portion is provided primarily for accommodating an anchor that can be shape-locked to the flared portion in a configuration corresponding to the flared portion. In order to form the widened portion, costly work is unavoidable, and a device for carrying out the work is liable to break down, and it has been impossible to install an anchor in a large hole.

Austrian Patent No. 368244 describes a device that is relatively cumbersome to handle to form such an expansion.
A device is described which includes a guide sleeve, an eccentric bush rotatably arranged in the guide sleeve, and a rotary shaft having a cutting head rotatably arranged in the eccentric bush. The eccentricity of the guide sleeve corresponds to the eccentricity of the eccentric bush. In the extreme positions of the guide sleeve and the eccentric bush, the rotary shaft has a central position in the guide sleeve. In the other extreme position, which makes an angle of about 180 ° to this, the axis of rotation moves radially outward with double the eccentricity. It penetrates into the hole wall of the cutting head between these two extreme positions. After full penetration, the eccentric bush and the guide sleeve are rotated together through a 360 ° angle.
This results in an annular expansion in the wall of the hole. After this, the eccentric bushing is turned or turned 180 degrees in the guide sleeve, so that the rotary shaft is centered in the guide sleeve and the punching device can be pulled out of the hole. A separate handle is provided for each of the guide sleeve and the eccentric bush for this rotation.

For improving the handling and reducing costs from an architectural point of view, in an apparatus operating on substantially the above-mentioned principle described in EP-A-231720, a guide sleeve is rotatable in a housing. Deploy. The eccentric bush is connected to a gear, and the gear is engaged with a rotating shaft that can be driven by a driving device. The eccentric bush and the guide sleeve are connected to each other by an axially detachable pin.
After inserting the device arranged around the rotation axis, rotate the eccentric bush 180 ° in the guide sleeve by the drive device,
Abut the removable sleeve on the guide sleeve. Furthermore, by continuing the rotation of the drive, the guide sleeve also rotates with the eccentric bush via the pin. After finishing the entire widening, the pin is removed in the axial direction, so that the eccentric bush can be further rotated in the guide sleeve, the hole in the eccentric bush is again centered with respect to the guide sleeve, and the hole is drilled. The device can be pulled out through a hole in the ground.

[Problems to be solved by the invention]

An object of the present invention is to form a hole having an enlarged portion,
An object of the present invention is to provide a drilling device which is simple in structure and handling, operates reliably, and operates on the eccentric principle.

[Means for solving the problem]

To this end, the punching device according to the invention is characterized in that a blocking element is provided between the housing and the guide sleeve, which allows the guide sleeve to rotate in only one direction relative to the housing.

According to the blocking element according to the invention, a freewheel is formed between the housing and the guide sleeve, the guide sleeve being able to rotate in only one direction in the housing and blocked in the opposite direction. This makes it possible to provide between the guide sleeve and the eccentric bushing a device which allows the eccentric bushing to rotate through 180 ° in the guide sleeve. Such a device may consist of a 180 ° annular groove and a pin that engages with the groove.

The piercing device can be inserted into the hole when the eccentricity of the eccentric bush and the guide sleeve is offset to center the rotational axis with respect to the guide sleeve. After inserting the drilling device into the hole until the housing abuts the ground, the eccentric bush is rotated in the guide sleeve until it stops, the cutting head biting into the wall of the hole. As it rotates further, the guide sleeve rotates with the eccentric bush. When the eccentric bush is further rotated through 360 ° together with the guide sleeve, an enlarged portion is formed, and when the eccentric bush is reversed by 180 ° in the reverse direction in the guide sleeve, the rotating shaft takes a central position in the guide sleeve. The blocking element then prevents the eccentric bushing from rotating with the guide sleeve.

In a preferred embodiment, the blocking element is formed by a tendril spring. The tendril spring is essentially a coil spring which is wrapped around a portion of the guide sleeve to provide frictional contact. One end face of the tendril spring is fixed to the housing to prevent the tendril spring from rotating with respect to the housing. In one-way rotation, the tendril spring unwinds due to friction and makes sliding contact with the guide sleeve, and the guide sleeve rotates relative to the housing. In the counter-rotation of the opposite direction, the tendril spring wraps more tightly around the guide sleeve and the friction provides a braking action, locking the rotation of the guide sleeve relative to the housing. This tendril spring has the advantage that it is extremely easy to manufacture and can be housed in a confined space.

In another preferred embodiment, the blocking element is formed with an inclined cam recess on the inner wall of the housing surrounding the guide sleeve, and the roller arranged in this inclined recess is frictionally engaged with the guide sleeve, so that the guide sleeve is attached to the housing. It may be constituted by a general grip-free wheel that allows rotation in one direction but locks rotation in the opposite direction.
This grip roller requires finishing to manufacture and requires as much space as a ball bearing, but is not very expensive.

In still another embodiment, the blocking element is formed by a ratchet. This ratchet is composed of a gear unit and a pawl that engages with the gear unit. The element of unidirectional rotation results from the asymmetrical profile of the gearing or the arrangement of the pawl pivot points.

Further, in a preferred embodiment of the present invention, the housing is made of two parts, one housing part is grounded, and the other housing part is provided with a guide sleeve.
It is axially displaceable with respect to the housing part mounted on the ground and a blocking element is arranged between the guide sleeve and one of these housing parts. Such a two-part construction of the housing makes it possible to form flared portions at different depths of the hole. This is necessary if the reinforcing bars are in the vicinity of the holes.

Preferably both housing parts are screwed together. The screws allow the two housing parts to be connected directly to one another. Removable detent elements can be non-rotatably coupled to prevent vibration during screw release or tightening operations. With the screw, both housing parts can be adjusted relatively axially.

Preferably, a flexible shaft is arranged between the rotating shaft and the driving device. The flexible shaft regulates lateral movement and allows eccentric insertion into the bore of the rotating shaft. In addition, the flexible shaft accommodates possible movements when the hole axis and the drive axis are not precisely aligned. A known element can be used as the flexible shaft.

Further, in a preferred embodiment, the housing is provided with an annular space for inflowing and outflowing cooling water, and the cutting head is provided with a connecting passage for guiding the cooling water. Such connecting passages to the cutting head allow working with diamond-loaded tools. Cooling water is used for cooling and for draining drilling debris and preventing dust accumulation.
The annular space for discharging the cooling water is sealed with a rubber or synthetic material sealing packing.

〔Example〕

 Next, a preferred embodiment of the present invention will be described with reference to the drawings.

The perforating device shown in FIGS. 1 to 4 is for forming an expanded portion 1b in the hole 1a of the ground 1 so that a shape-lockable anchor having a shape corresponding to the expanded portion 1b can be accommodated. . This punching device has a ground plate 2 that can be fixed to the ground 1, a column 3, and a drive unit 4 that can move along the column 3. For easy handling, the punching device is provided with grips 5, 6. The drive device 4 is moved along the support column 3 by the handwheel 7. Drive 4
Is provided with a tool holder 8. The housing 10 is pressed against the ground 1 by a spring lever 9. The housing 10 is crimped to the ground 1 by a tight packing ring 11. The housing configured as a screw sleeve 12 is screwed to the housing 10.

The housing 10 and the screw sleeve 12 are provided with a guide sleeve 13 provided with an eccentric hole parallel to the axial direction. An eccentric bush 14 is arranged in the eccentric hole of the guide sleeve 13, and the eccentric bush 14 is also provided with an eccentric hole. A handle 14a configured as a handle wheel is provided. The handle 14a serves to rotate the eccentric bush 14 in the guide sleeve 13.
A rotating shaft 15 is rotatably arranged in the eccentric bush 14.
The housing 10 includes an inner annular space 10a and an outer annular space 10b.
Is provided. The inner annular space 10a is sealed with respect to the guide sleeve 13 by a sealing ring 16. A release lever 17 is rotatably mounted on the housing 10 about a shaft 18 extending parallel to the longitudinal axis. Release lever 17 is bolted 19 by pin 20
Articulate to. The release lever 17 is held in the position shown in FIG. 3 by the compression spring 21. Bolt 19 is screw sleeve 12
Into the vertical groove 12a of the housing 10 and screw sleeve 1
It forms an anti-rotation device between the two. By actuating the release lever 17, the bolt 19 is pulled out of the longitudinal groove 12a and the threaded sleeve 12 can rotate with respect to the housing 10. This allows the threaded sleeve 12 to position the drilling device in the axial direction. For example, it can be adjusted when the expansion hole 1b is located in the area of the reinforcing bar. Such reinforcing rebar causes extremely high wear on the drilling tool.
After operating the release lever 17, the axial position of the screw sleeve 12, which forms the enlarged portion by rotation, is adjusted.

The inner annular space 10a and the outer annular space 10b are connected to a hose 24 via a connection pipe 22 and a sealing gasket 23. The hose 24 is used for inflow and outflow of cooling water. This is especially necessary when working with diamond mounting tools. The cooling water acts, on the one hand, to cool the drilling tool and, on the other hand, to let out drilling debris, and passes through the tool via the radial holes 13a and the passages 14b.

A tendril spring 25 is arranged between the screw sleeve 12 and a guide sleeve 13 rotatable within the screw sleeve. One end of the tendril spring 25 is fixed to a screw sleeve 12 of a part of the housing 10, and is wound around a guide sleeve 13 to make frictional contact. When the guide sleeve 13 is rotated in one direction with respect to the housing, the tendril spring unwinds the winding due to friction and makes sliding contact with the tendril spring, and the guide sleeve rotates relative to the housing. On rotation in the opposite direction, the tendril spring wraps more tightly around the guide sleeve, friction creates a braking action and locks the rotation of the guide sleeve relative to the housing. Instead of a tendril spring, it is also possible to provide a conventional freewheel, for example a freewheel in the form of a grip roller freewheel. This grip roller freewheel is
For example, at least one inclined cam recess (not shown) is formed on the inner wall surface of the torsion sleeve 12 of a part of the housing surrounding the guide sleeve 13, a roller is disposed in the inclined cam recess, and the roller is rotated. The guide sleeve 13 is pressed by a spring in the direction of the space narrowing toward one direction.
Rotation in this direction relative to the housing prevents rotation and allows reverse rotation. This tendril spring 25 acts as a blocking element and allows the guide sleeve 13 to rotate within the housing 10 or the screw sleeve 12 in only one direction. Freewheel instead of tendril spring, for example
A freewheel in the form of a clamp roller freewheel can also be provided. The detent 26 configured as a bolt with a head is arranged on the eccentric bush 14, and this detent 26
Is fixed to the curved groove 13b region of the guide sleeve 13 by a set screw 27. The curved groove extends over an angle of 180 ° to limit the range of rotation of the eccentric bush 14 in the guide sleeve 13. Rotation of the eccentric sleeve 14 in the guide sleeve 13 is essential, which allows the cutting head 28 arranged on the rotary shaft 15 to be moved from the central position shown in FIG. 1 to the maximum eccentric position shown in FIG. it can. The head of the detent 26 also serves to prevent axial movement of the eccentric bush 14 with respect to the guide sleeve 13. Prepared hole
After inserting the punching device into 1a, first the eccentric bush 14 is rotated by 180 ° with respect to the guide sleeve 13 by the handle 14a. As a result, the cutting head 28 fixed to the rotary shaft 15 with the nut 29 is pressed against the wall of the hole. Axis of rotation of cutting head 28
The non-rotatable connection to 15 is caused by the polygonal sides 15a. A key protrusion is provided on the rear end of the rotary shaft 15. Flange
Reference numeral 30 prevents the bearing 31 from moving in the axial direction, and the rotating shaft 15 is rotatably supported in the bearing 31. Another bearing 32 is arranged behind the flange 30. The socket 33 is connected to the flange 30, and the socket 33 surrounds the connecting portion 34, which is non-rotatably connected to the key protrusion 15b of the rotating shaft 15. The connecting portion 34 is non-rotatably connected to a flexible shaft 35, and the flexible shaft 35 is connected to the tool holder 8 of the drive device 4. In order to protect the flexible shaft 35, an elastic surrounding tube 36 is arranged around the flexible shaft 35. The flexible shaft 35 regulates the lateral movement of the drilling device with respect to the drive device 4.

Cutting head with rotating shaft 15 centered in hole 1a
By rotating the handle 14a while rotating 28, the eccentric bush 14 is gradually eccentric and gradually cuts the hole 1a in the lateral direction, and finally the detent 26 engages with the final end position of the curved groove 13b. After reaching the eccentric position shown in FIG. 2 of the required expansion depth defined by the above, the handle 14a is further rotated in the same direction. At this time, since the guide sleeve 13 also rotates together with the eccentric bush 14 via the detent 26, the cutting head 28 revolves around the center line of the hole 1a while rotating from the position shown in FIG. Become. Due to this revolution, the hole 1a is circumferentially machined at the required expansion depth shown in FIG. 2, and when the guide sleeve 13 makes one rotation with respect to the housing 10, the expansion portion 1b is formed over the entire circumference of the hole 1a.

When the handle 14a is turned in the opposite direction after the formation of the expansion portion 1b is completed, the decentering 26 of the eccentric bush 14 is bent by the curved groove 13.
Turn around the guide sleeve 13 to the initial end position of b,
The rotating shaft 15 returns to the center position. Even if the detent 26 is engaged with the initial end position of the curved groove 13b and the handle 14a is further rotated in the opposite direction, the rotation of the guide sleeve 13 in this direction is prevented by the action of the tendril spring 25. Therefore,
The rotating shaft 15a is held at the center position, and the punching device can be pulled out from the hole 1a.

[Brief description of the drawings]

1 is a side view of a preferred embodiment of a punching device according to the invention having a drive device movable along a column, FIG. 2 is an enlarged longitudinal sectional view showing a detail of a part of FIG. 1, 3 is a sectional view taken along the line III-III in FIG. 2, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1 ... ground, 1a ... hole 1b ... expansion part, 2 ... grounding plate 3 ... support post, 4 ... driving device 5,6 ... grip, 7 ... handwheel, 8 ... tool holder, 10 … Housings 10a, 10b… Circular space, 11… Packing ring 12… Thread sleeve (housing) 13… Guide sleeve, 14… Eccentric bush 14a …… Handle, 15… Rotary shaft 16 …… Sealing ring , 17 ...... Release lever 18 ...... Shaft, 19 ...... Bolt 20 ...... Pin, 21 ...... Compression spring 22 ...... Connection pipe, 23 ...... Seal gasket 24 ...... Hose, 25 ...... Tear spring 26 ...... Detent, 27 …… Set screw 28 …… Cutting head, 35 …… Flexible shaft 36 …… Enclosed tube

Claims (8)

(57) [Claims] 1. To form a widened portion in a hole in the ground (1),
The housing (10,12) to be installed on the ground and the housing (1
0) and an eccentric bush (14) which connects a handle with a guide sleeve (13) having an eccentric hole formed parallel to the axial direction and which can be rotated through an angle of 180 ° in the eccentric hole of the guide sleeve. And a rotary shaft (15) connected to the drive device (4) and having a cutting head (28), the housing (10, 12) and the guide sleeve (13) are provided with a housing (10). A perforation device having a blocking element for allowing the guide sleeve (13) to rotate in only one direction with respect to the (12, 12). 2. The blocking element according to claim 1, wherein the blocking element is formed by a helical spring (25), one end of which is fixed to the housing (12) and wound around a guide sleeve (13). The punching device according to claim 1. 3. A grip roller in which the blocking element has an inclined cam recess formed on an inner wall of a housing (12) surrounding a guide sleeve (13), and a roller arranged in the inclined cam recess is frictionally engaged with the guide sleeve. The punching device according to claim 1, wherein the punching device comprises a freewheel. 4. The punching device according to claim 1, wherein the blocking element is a ratchet. 5. The housing (10, 12) is made up of two parts,
One housing part (10) is grounded and the other housing part (12) has a guide sleeve (13).
An axially movable housing part (10) which is grounded to the ground, wherein a blocking element is arranged between the guide sleeve (13) and one of these housing parts (10, 12). The punching device according to any one of 1 to 4. 6. A punching device according to claim 5, wherein both housing parts (10, 12) are screwed together. 7. The punching device according to claim 1, wherein a flexible shaft (35) is arranged between the rotary shaft (15) and the drive device (4). 8. A housing (10) is provided with an annular space (10a, 10b) through which cooling water flows in and out, and a cutting head (2).
The drilling device according to any one of claims 1 to 7, wherein a connection passage for guiding cooling water is provided in (8).